Java program to count the number of vowels in a String
Program to Count the Number of vowels
Program to Count the Number of vowels we’re going to check how many vowels are present in a given String . There are five vowels in English vocabulary, they are – ‘a’, ‘e’, ‘i’, ‘o’, ‘u’.
A String is entered in this case is “s” variable So, we need to check how many vowels are present in given string
For Example, in the string prepinsta then in that case then vowesl are 3 (a,e,i)
Algorithm
- Take a String input from user store in variable called “s”
- Convert String to char array using toCharArray()
- Start for loop from i=0 to i<s.length()
- Check condition if s.charAt(i)==’a’ or s.charAt(i)==’e’ or s.charAt(i)==’i’ or s.charAt(i)==’o’ or s.charAt(i)==’o’ to increment vowel++
- Take else if part s.charAt(i)>=’a’ && s.charAt(i)<=’z’ to increment consonant ++
- Take another else if part s.charAt(i)>=’1′ && s.charAt(i)<=’9′ to increment digit++
- Take another else if part s.charAt(i)==’ ‘ to increment whitespaces++
- Take else part to increment symbols++
Code in Java
Run
// Write a program to calculate the number of vowels present in the string in java
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
String s = "prepinsta";
char[] c = s.toCharArray();
int vowel=0;
for (int i = 0; i < s.length(); i++) {
if(s.charAt(i)=='a' || s.charAt(i)=='e' || s.charAt(i)=='i' || s.charAt(i)=='o' || s.charAt(i)=='u')
vowel++;
}
System.out.println("Vowels: " + vowel);
}
}
Output
Vowels: 3
Note
The time complexity of above code in O(n) as in the code we are looping over the sting once
Method 2
- First take the string input in a string variable and make a function countVowels(str,str.length())
- if the value of n that is (length of string) is 1 then we will return . (This is the base case)
- if the size of the string is not 1 then countVowels(str, n-1) + isVowel(str[n-1])
- Here isVowel(str[n-1]) will be called if the character is vowel then this will return 1 otherwise 0
Run
public class Main {
static int isVowel(char ch) {
ch = Character.toUpperCase(ch);
if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U')
return 1;
else
return 0;
}
// to count total number of vowel from 0 to n
static int countVowels(String str, int n) {
if (n == 1) return isVowel(str.charAt(n - 1));
return countVowels(str, n - 1) + isVowel(str.charAt(n - 1));
}
// Main Calling Function
public
static void main(String args[]) {
// string object
String str = "prepinsta";
// Total numbers of Vowel
System.out.print("Total number of Vowel = ");
System.out.println(countVowels(str, str.length()));
}
} Output
Total number of Vowel = 3
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import java.util.*;
class HelloWorld {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String s=sc.nextLine();
int count=0;
for(int i=0;i<s.length();i++){
char c=s.charAt(i);
if(c == 'A' || c == 'E' || c == 'I' || c == '0' || c == 'U' || c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'){
count++;
}
}
System.out.print(count);
}
}
import java.util.Scanner;
public class String2 {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String s = sc.next();
char[] ch = s.toCharArray();
String v = “AEIOUaeiou”;
char [] vow = v.toCharArray();
int count = 0;
for(int i=0; i< ch.length; i++){
for(int j=0; j< vow.length; j++){
if(ch[i] == vow[j]){
count++;
}
}
}
System.out.println(count);
}
}
import java.util.*;
public class Main
{
public static void main (String[]args)
{
String str=”Gyanendra Tiwari”;
System.out.println(find(str));
}
public static int find(String str){
int count=0;
for(int i=0;i<str.length();i++){
char ch=Character.toLowerCase(str.charAt(i));
if(ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u'){
count++;
}
}
return count;
}
}
import java.util.Scanner;
public class Vowel {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.println(“Enter the String:”);
String s = sc.nextLine();
int count = 0;
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U' || ch == 'a' || ch == 'e' || ch == 'i'
|| ch == 'o' || ch == 'u') {
count++;
}
}
System.out.println("The number of vowels are in " + s + " is " + count);
}
}
public class Main
{
public static void main(String[] args) {
String s = “prepinsta”;
char[] c = s.toCharArray();
int vowel=0;
for (int i = 0; i < s.length(); i++) {
if(s.charAt(i)=='a' || s.charAt(i)=='e' || s.charAt(i)=='i' || s.charAt(i)=='o' || s.charAt(i)=='u')
vowel++;
}
System.out.println("Vowels: " + vowel);
}
}
import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
int count = 0;
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
if (c == 'A' || c == 'E' || c == 'I' || c == '0' || c == 'U' || c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') {
count++;
}
}
System.out.println(count);
}
}
public class Main
{
public static void main(String[] args) {
String str=”prepinsta”;
int count=0;
for(char ch: str.toCharArray()){
if(ch==’a’||ch==’e’||ch==’i’||ch==’o’||ch==’u’)
count++;
}
System.out.println(“Number of vowels= “+count);
}
}
import java.util.Scanner;
public class p3 {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.println(“Enter a String”);
String s1 = sc.nextLine();
int vowel = 0;
int consonant = 0;
for(int i = 0 ; i <s1.length() ; i ++){
if(s1.charAt(i) == 'a' ||s1.charAt(i) == 'e' ||s1.charAt(i) == 'i' ||s1.charAt(i) == 'o' ||s1.charAt(i) == 'u' ||s1.charAt(i) == 'A' ||s1.charAt(i) == 'E' ||s1.charAt(i) == 'I' ||s1.charAt(i) == 'O' ||s1.charAt(i) == 'U' ){
vowel ++;
}else{
consonant ++;
}
}
System.out.println(vowel + " vowels present");
System.out.println(consonant + "consonants present");
}
}
import java.util.*;
class Baba {
public static void main(String[] arfs) {
Scanner sc = new Scanner(System.in);
System.out.print(“Enter a String: “);
String s = sc.next();
int count = 0;
for(int i=0; i<s.length(); i++) {
char x = Character.toLowerCase(s.charAt(i));
if(x == 'a' || x == 'e'|| x== 'i'|| x=='o' || x=='u') {
count++;
}
}
System.out.println(count);
}
}
import java.util.Scanner;
public class vowelcount {
public static void main(String[] args) {
int c=0;
String vowel=”aeiouAEIOU”;
Scanner sc= new Scanner(System.in);
String s= sc.next();
for( int i=0;i< s.length();i++){
if( vowel.indexOf(s.charAt(i)) !=-1){
c++;
}
}
System.out.println(c);
}
}
package arrays;
class distinct {
public static void main(String[] args)
{
int count=0;
String str=”abhiaei”;
for(int i=0;i<str.length();i++) {
char ch = str.charAt(i);
if (ch=='a' || ch=='e' || ch=='i' || ch=='o'|| ch=='u') {
count++;
}
}
System.out.println("vovels " +count);
}
}
Thank you prepinsta for publishing my code…